Controlling device for sand-blast apparatus.



F. A. COLEMAN, D. S. HAWKlNS & A. 1. FARRELL. 001111101111116 DEVICE FoR SAND BLAST'APPARATUS.

` APPLICATION FILED JAN. 31. 1914.

1,172,008'. Patented Feb.15,1916.

2 SHEETS-SHEET l.

THE COLUMBIA PLANOGRAPH Ca.. wAsmNG'roN, D. c.

F. A.\COLEN|AN, D. S. HAWKINS & A. J. FARRELL.

CONTROLLING DEVICE FOR SAND BLAST APPARATUS.'

APPLICATION FILED 11111.31, 1914.

Patented Feb. 15, 1916.

2 SHEETS-SHEET 2- lgen/@H5 www /Sa/JL. j//g- 'r1-u: COLUMNA PLANOGHAPH co., wAsHxNGToN, D. c

. teristics; are hereinafter set forth. in the;y

UNITED STATES PATENT ioEEIoE. f

FREDERICK A. COLEMAN, OE GATES MILLsf'ANn DAVID snAwKINs ANn` ALBERT L EAERELL, OE CLEVELAND, oH1O,AssIGNOEs To THE COLEMAN EOUNDEYEQUIP- vMENT COMPANY, OE CLEVELAND, OHIO, yAoomeonifiJrIoN or OHIO. v

CONTROLLING DEVICE FOR SAD-BLAST APPARATUS.,

To all whom t may concern Be it known that Vwe,.FRED1:RIo1 A. COLE- MAN, DAVID S. HAwKINs, and ALBERTV J. FAERELL, each a citizen of the United States,

and residing the firstat Gates Mills and the last two at Cleveland, Veach in Cuyahoga county and State of Ohio, have invented a certain new and useful Improvement in Controlling Devices for Sand-Blast Apparatus, of whichrthe following is a full, clear, and exact descriptiomreference being had to the accompanying drawings. A

This invention is for a device for controlling the ow of sand-and air in a sand blast apparatus. l Y

An Object is to provide a device by which the flow of sand and air may be controlled from one point and in very simplel manner,

trollingV means to clean out the `hose and a.

valve in the sand blast passage before the closing movement of this valve is started.

Another object is to provide a means in an air passage for regulatingthe proportion of sand and air in the sand blast, and still another object is to provide for shutting oii" the sand blast without lowering or materially changing the pressure in 4the sand tank.

The drawings show a preferred form of the device embodying the invention which is hereinaftermore fullydescribed inconnection therewith, and the essential characclaims.A

, In the drawings Figure 1 is a side elevation of our device showing the arrangement of the pipe connections leading to and from the sand tank;.Fig.,2 is a vertical section taken substantially on the axis of the valve plugs; Fig. 3 is a vertical section taken on the line 3 3 of Fig. 2; Fig. 4 is a substantially horizontal section taken on the line vf1-L1 of Fig. 2 showing the valve for regulating the flow of air through the device; Fig. 5 is a fragmentary section taken on the Specification of Letters; Patent.

sameplane .asi'jF ig. 2 showingone of the Y valveparts in another position; Fig. 6`is a transverse 'section takenlon the line 6,'-6 of".

Fig. 2; Fig. 7 is a ytransverse section taken on' the line 7-7 of Fig. 2; Fig. 8 is a sectional detail taken on the line 8f8` of Fig. 2,1 showing the lugs between Athe two valve P ugS- Referring to Fig. 1, lO'indicates' theusual sand tankto which leads an air pipe 12 connected with a suitable -source of pressure fluid supply. This pressurefuidiishereinafter referred to as air.y The bottom of the tank 10 is funnel-shaped as atll, in the usual manner, and leading from theV bottom A is a pipe lthrough which'the sand flows to a pipe lleading to our controlling device, Shownat'lS. Leading from the 'air pressureline 12, is a branch passage lor pipe 19 opening into the controlling device, through which' the air which is mixed with the sand providing Athesand blastfis supplied. 20 indicates a pipe leading `from the controlling device and Vto .which'the usual hose is connected for leading the sand blast to the desired point. v22 indicates a suitable. hand leverwhich may be moved through al half Patented Feb. 15, 1916. Application `filed January 31,1914.Y Serial No. 815,611.

revolution to operate the valves of the device, as will ,be hereinafter described. 23 is a. vValvefor shutting olf the supply of air to the apparatus when it is desired to stop for any length of` time, and 24Ck isa valve,

which 'may be Opened to exhaust V,the air from the sand tank before filling the same. Mounted inthe upper portion 25 of the casing of the' controlling ldevicegis a transverse rotatable valve plug 28 having `an, Opening'k 29 therethrough communicating .with a vertical passage 30 leading upwardly from blast passes. The plug 28 has projections 32 on its inner end adapted to-.be` engaged by A below the casing andthrough which the sand projections 33 on the adjacent'end` of a sec- .ond rotatablevalve plug 35. These projec'-,`

tions Vare so arranged that `the plug 28 is 'l rotated one-quarter turn by a one-half rotation given to the kplug 35.` On the opposite end of thisfvalve plug is a cylindrical portion 36 over' which is fitted an, eyev 37 of a crank arm 22,` which is secured -in place by -asuitable nut 38. n ABoth of these valve plugs are fitted, linto a tapered V bore and the plug 35,*la'st described, is drawn to its seat by the V'through' the pipe 20.

action of the nut 38, the eye 37 of the crank operate with external threads on a flangedportion 47 of the. casino.VVV The cap itself is f prevented from turning lby means of. a pointed set screw t8 adapted to engage the flange e7, and be locked in engagement with a suitable nut 49.

The Aupper portion of the casing is provided with a horizontal lange 50 adapted to'rest on a similar flange 51 oni'the lower portion 5l of the casing. These flanges are. providedV with suitable out? wardly extending ears 55 through which are made bolt holes 56 Vadapted to receive the bolts 57 vby which the Vtwo portions of the casing are secured together. A' layer of suitable packing Y58" is provided between the two portions of the casing .t0 make them thoroughlyl airtight.'r y l Acircular eddy chamber GOiii the lower casing opens upwardly into the ypassage 30 of the upper casing. up into this eddy chamber, where it is mixed withthe air, as will be hereinafter described, through a? short tube 62 rigidly mounted in a contracted portionti?) beneath the eddy chamber. This tube communicates at its lower endwith the pipe v16 leading from the sand tanlr. The passage from the pipe 16 to the pipe '62 is made, funnelshaped, as shown at 65, to provide for the sand passing readily into the pipeQ.

lVhen in operation, the sand is `mixed with the air at the upper portion -of the eddy chamber 60 and the blast passes upwardly through they` passage v30 and the opening Ql'inl the valveplug 28 and lout The airwliich mixes with the 'sand is brought into the lowerl side of the eddy chamber 60 through a passage 68, which.communicateswith a-fpassage '70 extending downwardly from the lower vside of the seat of the valve plug This lvalve plug isliollow, as shown, andthel `air is brought into it through the pipe 19,. which is threaded into a boss 72 extending ,out-` wardly from the side of the casing adjacent theyalve plug From this pipe Ythe air passes into 'the interior of this valve plug, through the opening 73 and then passes from the interior of the plug to the passage TOV through an opening 75 in the side of the plug. The two Valve plugs are shown in their operative position inFig. 1. That is, with the opening 29 in alinenient with the passage 30, the opening 73 coininiinicating with the pipe 19, and theopening 75 registering with thepassage 70.

The sand is brought.

tion, but does not move the plug v28.

lilith tlieparts in this position, the air from the pipe 19 is directed through the passages just described to lthe eddy chamber 60, where it swirls around the annular space outside of thepipe @Zand thenY passes up-V wardly through the passage 30 `carrying with it the sand, which isfed upwardly,k

through the Vpipe l16 vandV the tube 62, by.k means of the pressure within the sand tanli.- VThis thoroughly mixes the sand with the air and produces the desired sand blast.

To cont-rol theamount oi air mixed with the sand in the eddy ,chamber and .thereby regulate the sroportionate"amounts of sand and air iii-the sand blast, we provide a suitablevalve plug 76 lhaving an .opening '77 therethrough adaptedto register with the passage TO or be turned transversely of this passage, entirely closing the saine..

This plug is provided with a suitable thumb piece or wing79 outsideL of the casing. by.

whichitmaybe rotated to regulate thezow of air. A projecting lingeror pointer 8O Figsfl and el)v stands over an arcuate boss S2 on the side of the casing. This boss may be suitably marked or 'graduated to indicate valves'in the` following manner: t-lie first quarter rotation of" the lever 22 moves the valve plug 35 through. a quarter rotainoves the openingfin the plug ll-Wl from asmall air clianiberor passage the boss 72, l.tliirough which .the air 'passesA to the interioifoic the plug. On this iii/ovement` the opening 75 is inovedinto This communication .with this small chamber 485,.y thereby closing thepassage 70 and directing the air, which enters the-plugthrough the opening 751i Vtlirough an opening 88 in the plug. into a passageway -89` which opens into the passagewayBO. The position of the openings'. after this `quarter rotation is shown in Figs. 5, 6 and?5 (the direction of the Vair being, indicated bythe arrow in` The'effect of .stopping the passage of `air through the passages 70 and 69 and direct-` ing it through the passage 89V to the passage 30 brings theY air above the chamber where the sand is .mixed with the airr and causes i Atthe Sametime the air.ien`

Y ing the escape vof sand or air from the sand tank. pressure of air in the pipe 12 and by thus closing the lpassage 30, the pressure in the tank is maintained, which allows theblasting operation to be resumed at once upon a reverse movementot' the lever. Y

In closing off the sand blast it is well to make a slight pause with the lever in the vertical position, shown in Figql, and the valve plug 35 in the pcsitionshown in Fig. 5, equalizing the pressure in the sand tank thereby stopping the flow of sand and cleaning the passages and the valve 280i: any

particles of sand that may4 have lodged therein. This provides for the closing movement of the plug 28 occurring only when the passage isentirely free of particles of sand,

thus'very greatly prolonging the life of this" valve. This pause atV the saine time allows the air entering through the passage 89 to entirelyY cleanV the entire passage including the hose, of all sand, blowing the saine fromV the blast nozzles before the lever'is moved the second quarter rotation closing the valve 2S and the air passages, as described.

To prevent the sandwearing away the interior of the casing above the mixing chamber 60, we provide a lining or bushing 90 of soft resilient material such as` soft rubber,

' which experience has demonstrated, resists the wearing'action of lthe sand very effectively. f

It will be seen from the foregoing .description that kwe have provided a sand blast controlling device which is so arranged that the iow of sand is controlled by the action of the air and the air which is used to stopthe flow of sand also acts to clean the sand blast passages and the valve therein.` Accordingly, none of the valve bearings of our device will be worn by the acti-on of the sand, as no sand passes through the valves controlling the air and the valve in the sand blastV passage is automatically cleaned by the air before its closing movement is started. 1

Having thus described our what we claim is:

1. The combination of a sand tank, a source of pressureiluid supply, a conduit f invention,

therefromto the sand tank, a sand Aconduit This, however, does not affect the leading from. the tank, means for directing pressure fluid Afrom the source'of supply to the last named conduit against 4the pressure in the tank, thereby balancing the saine andl stopping the flow of sand, means 'for thereafter closing they sand conduit at a point re-Y moved from the point where thesand is stopped, and` anV operating device common tov both or' the last mentioned means and adaptin respect to time.

ed` to .operate the same inV their proper order? Q 'A controllingjdevice for a sand blast .Y apparatus comprising a mixing chamber-ay Y conduit for sand leading to saidA mixing cha-mber, an airV passage leading to said mixing chamber, a conduit for the sand blast leading fromsaid mixingl chamber, an airvpassage leading tothe sand blast conduit, a Y

valve adapted to direct air toiei'ther or both of said air passages, a valve in the sand blast conduit, and a connection between A.said valveswhereby the .latter may be operated consequent upon the movement mentioned valve.

3. In a sand blast apparatus,`the combination, witha sand tank, a source 'of pressure iuid supply, ya conduit leading therefrom .to

the sand tank anda conduitffor the sand leading from the sand tank, of a controlling device havinga mixing chamber intoA which said conduit yit'orsand opens, a conduit for pressure fluidk leading from the source of pressure Huid to the'controlling device, the

'controlling device havingk a pressure fluid passage therein leading to the mixing chamber, a passage therefrom for the sand blast, a passage leading to the sand blast passage at a point separated from the mixing chamber, a valve adapted to direct pressure fluid to either' of these passages whereby the sand may be mixed withA the pressure iuidv or the Y flow thereof maybe stopped byfcounteracting the'pres'sure which forces it through the sand conduit, a second valve in the passage for the sand blast, and connecting members between said valves whereby the last named valve is operated by the movementofthe first mentioned valve.

'iic

4. Ina sandblast apparatus, the'combi- 'i nation with a source of pressureuid, a sand tank and a conduit theretofrom the source of pressure vfluid and a conduit for theV sand leading from the sand tank, of a controlling device ycomprising a mixing chamber into which the conduit for sandy opens,a'passage` for the sand blast, a passage for pressure Huid leading to the mixing chamber, a passage leading to the sand blast conduit ahead of the mixing chamber, a valve directing the pressure fluid to either of said passages, a conduit leading from the source of pressure fluid to the Acontrolling deviceand communicatingk withsaid valve, a second valve in the sandblast conduit, connections between said said mixing chaml'ier, a conduit for the `sand blast leading from y'the mixing chamber, means for regulating the flow oi air to the mixing chamber, a lvalve in the sand blast conduit on the side of the .mixing chamber remote from said sand tank, means for creating a preponderance of pressure between the valve and the tank in tlie-sand conduit forma back pressure. whereby the iiow of sand is stopped and at the same time the sand blast conduit is cleaned, and means for thereafter closing the valve in said conduit.

(l. ln a sand blast apparatus, the combination ot' a conduit for the sand and a conduit for air, a controlling device comprising a casing to which each ot said conduits leads,

a mixing chamber in said casing, a passage for air leading to said mixing chamber with# l inthe casing, a passage for the sand blast leading through said casing, a second .passage iorair leading to said sand blast passage ahead of the mixing chamber, a valve plug in the casing having openings communicating with. the passage leading to the mixing chamber and passage leading to the sand blast' passage, said openings being so arranged that when one of these is closed` the other is open, means for moving said valve plug vto shut oli' the passage leadingto the mixing chamber `and, allow air to pass to the conduit for the sand blast, Vthereby couiiteracting the pressure of the sand, stop ping the flow thereo` and at the saine time cleaning the passage for the sand blast, a valve plug in said passage for the sand blast, a connection between said plug and the lirst mentioned plug whereby the last named plug may be rotated after the iiow of sand is stoppedand the passage is cleaned.

'7. A controllingjdevice for a sand blast apparatuscomprising a casing` having therein a mixing chamber to which the sand conduit leads, a passage leading from. said mixingv chamber, a rotatable valve plug, a conduit for air leading to the casing and adapted to be closed by said valve plug, a passage leading to themixing chamber adapted to be closed by said valve plug, a valve plug adapted to close the passage for the sand blast, said plug being in alineinent with the first mentioned plug, and` means for rotating both plugs.

8. ln a controlling device for a sand blast apparatus, the combination of a casing having therein a mixingchamber, a passage for the sand blast leading .therefrom through?.

the casing, a conduit for air leading to the casing, a rotatable valve plug closing the conduit for such air, a passage for air leading from the valve to the mixingchamber,

a second passage/for air leadingfrom the val-ve `to the.A sandl blast. conduit, a second valveplug closing Ythe sand blast passage,.

9. A controlling device for a Isand blast. apparatus comprising a casing havingpak K mixing chamber through' which the l.sand

conduit leads,'a .short tube projecting upwardly in said mixing ,chamber through which the sandpasses, an annular passage for air around said projection, and a passage for air leading to said mixing chamber at the lower portion thereof, a passage for the sand blast, a passage forair leading to the sand blast passage above the mixingI chamber, and means for closing the air lpassage to the mixingchamber and openingthe air passage to the blast passage tostop the iow or' sand and clean the sand blast passages.: 'y I l0. A controlling device for la sand blast= apparatus comprisingy a casing'having a mixing chamber through which the sand conduit leads, a short tube projecting upwardly in said mixing chamber through which the sand passes, an annular passage.k for air around saidprojection, and a passage for air leading to said mixing chamber y at the lower portion thereof, a passagefo'ry the sand blast, a valve in said sand blastr passage, a vpassage for air leading to the sand blast passage above the mixing cham-y ber,'means for closing` the airk passage to the mixing chamber-and opening the` air passageto the sand blast passage to stop the flow of sand and clean the sand blast passage, andmeans for closing the sand blast passage by moving the lirst mentioned means. j

ll.` In a A devicefor 'controllingI a sand blast apparatus, the combination of a casing into which the sandenters at one end, a passage for thesand blast leading through. the casing, a mixingchamber at one end of said passage, an air passage within the casing leading ytothe mixing chamber, and a f second air passage leading to the sand blast passage ahead of the mixingl chamber, a. valve plug lying transverselygof the sand blast passage, a hollow valve plug adapted to close and open each of said air passages.,A an air chamber at one sideof said plug, the

plug having openings each adapted to Communicate with said last mentioned Chamber when the plug is in different positions, a

l'means for rotating'said plug, and connections between said plug and the first mentioned plug whereby the latter plug is rotated.

l2. In a sand blast apparatus, the combination of a tank, a source of pressure fluid supply, a conduit therefrom tothe tank, a conduit for sand leading from the tank, a mixing chamber in said last named conduit, means for bringing pressure Huid to said mixing chamber, a valve controlling the mixture, a valve for closing the sand conduit connected with the first valve, a passage from the iirst valve to the sand conduity between the valve in the conduit and the tank, and means for operating both of said valves to direct air to the mixing chamber or to the sand conduit between the valve and the mixing chamber to balanceV the pressure in the tank and stop the flow of sand and thereafter close the valve in the sand conduit.

13. In a sand blast apparatus, the combination of a sand tank, means for supplying pressure fluid thereto under a constant pressure, a conduit forsand leading from the sand tank, two passages for pressure fluid, one of said passages being arranged to enter the conduit so as to mix with the sand and force the same away from the sand tank and the other of said passages so entering the conduit that a portion of the pressure fluid flowing therethrough tends to iiow toward the sand tank so that it may counterbalance the pressure forcing the sand along the conduit and stop the flow of sand, valve means for oontrolling'each of said passages, and a common operating device for said valve lmeans for controlling said passages to open either or close both of the passages at one time, a single operating means for said valve means, and means operatively connecting the valve means with the valve in the sand blast conduit.

In testimony whereof, we hereunto aiiix our signatures in the presence of two wit-- nesses.

FREDERICK A. COLEMAN. DAVID S. HAWKINS. ALBERT J. FARRELL. Witnesses:

JUSTIN W. MAGKLIN, BRENNAN B. WEST.

Copies of this patent may be obtainedv for five cents each, by addressing the Commissioner of Patents,

Washington, I). C. 

